/*
 * This file is part of muCommander, http://www.mucommander.com
 *
 * muCommander is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * muCommander is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.mucommander.ui.text;

import java.awt.Color;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.BorderFactory;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.border.Border;

/**
 * <code>RecordingKeyStrokeTextField</code> is a text field that record a KeyStroke entered by the user.
 * 
 * @author Arik Hadas
 */
public class RecordingKeyStrokeTextField extends JTextField implements FocusListener, KeyListener {

    /** The last KeyStroke that was entered to the field. */
    private KeyStroke lastKeyStroke;

    /** The default border of JTextField */
    private final Border defaultTextFieldBorder = getBorder();

    public RecordingKeyStrokeTextField(int columns, KeyStroke keyStroke) {
        // set text field's length
        setColumns(columns);
        // The text will be shown at the center of the text field
        setHorizontalAlignment(JTextField.CENTER);
        // The text field should not be editable
        setEditable(false);
        // Change colors to prevent the user from marking the field's text
        setSelectionColor(UIManager.getColor("jtextfield.background"));
        setSelectedTextColor(getForeground());
        // Use JTextField's "setText" method to set the initial KeyStroke in the text field
        super.setText(KeyStrokeUtils.getKeyStrokeDisplayableRepresentation(lastKeyStroke = keyStroke));

        // Add listeners:
        addFocusListener(this);
        addKeyListener(this);
    }

    /**
     * This method is used to fetch the KeyStroke in the text-field.
     * The returned KeyStrole is the last KeyStroke entered to the field by the user, or
     * the initial KeyStroke that was loaded to the field if the user didn't entered anything.
     * 
     * @return the KeyStroke in the text-field
     */
    public KeyStroke getKeyStroke() { return lastKeyStroke; }

    //////////////////////////////////
    /////  FocusListener methods  ////
    /////////////////////////////////

    public void focusGained(FocusEvent e) {
        // change border to indicate this field gained the focus
        // and the user can type
        setBorder(BorderFactory.createLineBorder(Color.orange, 2));
    }

    public void focusLost(FocusEvent e) {
        // change border to indicate this field lost the focus
        setBorder(defaultTextFieldBorder);
    }

    //////////////////////////////// 
    /////  KeyListener methods  ////
    ////////////////////////////////

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() != KeyEvent.VK_ESCAPE)
            setText(KeyStrokeUtils.getKeyStrokeDisplayableRepresentation(lastKeyStroke = KeyStroke.getKeyStroke(e.getKeyCode(), 0)));
        e.consume();
    }

    public void keyReleased(KeyEvent e) {}

    public void keyTyped(KeyEvent e) {}
}
